Pump



March 14, 1950 R. H. FREDERICK PUMP 2 Sheets-Sheet l Filed Ooi. 25. 1946E w VB. f N L V Aww@ .A A 1W Rm, l mw Weue @zw Mya/wg; M@

March 14, 1950 R. H. FREDERICK 2,500,812

PUMP

Filed oct. 25, 1946 2 sheets-sheet 2 Imelltor Patented Mar. 14, 1950UNITED STATES PATENT OFFICE y PUMP Rheuel H. Frederick, High Bridge, N.J.

Application October 25, 194.6, Serial No. 705,582

(Cl. S-152) 5 Claims.

This invention relates to a pump and has for its primary object tocompress or exhaust fluid according to the use desired.

Another object is rapidly to displace fluid by drawing it into andexpelling it from the cylinder.

A further object is to avoid the necessity of using expensive packingand the like about a piston rod and a piston operable in a cylinder forpumping fluid.

A still further object is to simplify the drive of a reciprocatingplunger such as would be employed for operating a piston within acylinder.

Other features include an arm extending laterally from the plunger rodshoes carried by the arm and riding against opposite faces of the camdisk to cause the plunger rod to reciprocate as the disk rotates and aguide for holding the arm against turning movement about the axis of theplunger rod.

In the drawings:

Figure l is a side view partially in section of a pump embodying thefeatures of this invention.

Figure 2 is a transverse sectional substantially along the line 2-2 ofFigure 1.

Figure 3 is a transverse sectional view taken substantially along theline 3-3 of Figure 1, and

Figure 4 is a longitudinal sectional view taken substantially along theline 4-4 of Figure 1.

Figure 5 is a perspective view of the actuating arm of the plunger rod.

Referring to the drawings in detail, a prime mover designated generallyby reference numeral I Il is encased within a housing II and carries adrive shaft I2. The prime mover may be an electric motor, internalcombustion engine or any other suitable mechanism capable oftransmitting rotary motion to the drive shaft I2.

Bolted or otherwise attached to the end of the housing II through whichthe drive shaft I2 projects is a suitable casing designated generally I3which comprises a substantially cylindrical member I4 provided at itsunderside with a trough I5 forming a guide way. Extending from the endof the cylindrical body i4 opposite that which is attached to thehousing II is a tubular extension I6 terminating in an attaching flangeI1 forming its outer face with an annular recess I8 therein. Formedaxially of the end wall of the tubular extension I6 is an inwardlyextending tubular boss I 9 in which a bushing is fitted. A radialbreather opening 2I is formed in the tubular body I4 and threaded thereinto is a breather pipe 22 the upper end of view taken i'.

2 which is preferably fitted with a suitable filter 23 so that airentering the interior of the tubular body I4 will be cleaned.

Attached to the flange I1 in any suitable manner is the attaching flange24 of a cylinder 25, the outer end of which is closed by end wall 26,the opposite end of the cylinder 25 being in alignment with the tubularextension i6. Formed at diametrically opposite points on the cylinder 25are ports 21 which are closed by inlet and outlet valves 28 and 29,which are normally urged into closed position under the influence ofcompression springs 30 and 3| respectively. The valve 28 opens inwardlyinto the cylinder 25 so that as the fluid displacing element to be morefully hereinafter described moves to increase the volume of the cylinderthe valve 28 will open to admit uid to the cylinder. The valve 29 on theother hand is adapted to open outwardly so that when the fluiddisplacing element moves to reduce the capacity of the cylinder thevalve 29 will be forced open and the fluid admitted through the valve 28will be expelled through the port 21. Suitable cages 32 enclose thevalves 28 and 29 and are tapped as at 33 for connection with anysuitable uid system.

Mounted to reciprocate through the bushing 20 is a plunger rod 34 whichas illustrated extends into the cylinder 25 and carries at its outer enda head 35 to which is attached one end of a bellows 36, the opposite endof which is provided with an out-turned flange 31 to be clamped in therecess I8 between the flanges I1 and 24 to form a uid tight junction andeffectively close the open end of the cylinder 25. It is to -beunderstood of course that the end of the bellows which is attached tothe head 35 is also rendered fluid tight so that as the rod 34reciprocates fluid entering the cylinder will be expelled through thevalve 29. Formed at the end of the rod 34 opposite the head 35 is acylindrical extension 38 forming a support for a laterally extending armdesignated generally 39. This arm comprises a socket 40 provided with anopening 4I in which the cylindrical extension 38 is round headed pins 46are tted. Formed longilution of the 4drive shaft tuclinally in theextension 43 is an elongated slot 41 which as illustrated extendsthrough the lower end of the arms 42. Supported in an internally screwthreaded boss 48 carried by the bottom Wall of the trough l5 is a stud49 upon which a roller 50 is mounted. This roller is received in theslot 4l and serves as a guide to hold the arm 39 and rod 34 againstrotary movement. Extending longitudinally from the ends of the extension38 on 'the rodll is a pilot-'shaft 5l, the purpose of which will be morefully hereinafter described.

Keyed or otherwise attached as at 52 to the drive shaft i2 of the primemover lll is a sleeve 53 Which extends axially beyond the end of theshaft i2 and carries an angularly `@disposed=cam disk 54, the peripheryof which rides between the studs 46 as will be readily understood uponreference to Figure l. A bushing 55 'is .fitted in the end of the sleeve53 opposite that receiving the drive shaft .i2 .and received .in .the.bore

of .the lbushing .55 Lis the pilot El. .It l.tius be seen that the shafti2., Aplunger .nod f3.4 and sleeve 53 ere Vin .longitudinal alignment.along a .common axis. Riding von opposite aces .of .the disk .54 andbearing .against the .rounded .end .of

Athe stud '4E are .shoes .5d Shaving spherical re'- @cesses 5l in Iwhichthe spherical heads of 'the studs HEarereceived.

.Formed in 'the .sleeve 53 'between `the end of the pilot ,53| .and theend A.of the driveshaft l2 is .an .annular row vof spaced .radial vents58, and arow of yents`59 .extends .annularly through lthe end .wall Vofthe tubular extension l5 .so vthat air trapped `within the bellows '36may be ex- `pe'lled .in'to the interior of the housing l5 and Amove theplunger rod `3Il 'bac'k and forth, thus expanding and contracting .thebellows y3.6 so as to alternately increase land decrease the capacity ofthe .cylinder 525. Obviously 'as the bellows contracts the valve '2'8will .be disengaged from its seat 'so as to admit fluid `into thecylinderi25,

.and when 'the lbellows is .expanded the fluid so [admitted will be.discharged through 'the port "2l by forcing the valve 29 to openagainst its spring "31. By reason vofthe direct connection o'f the.plungerrod 34 with the ldrive shaft l2 .it will be obvious that iiuidmay be'pumpedthrough th'ecylinder 25 with '.jgreatrapidity, as thebellows will be expanded VVand contracted with each revo- I2. Obviouslythe Cil pump may be employed not only to compress fluids, but also itmay be used to exhaust fluids from a container and it may be employed asa vacuum pump. By y employing the bellows 36 and the head 35 as the uiddisplacing means it is obvious that piston rings and packing around theplunger rod 34 may be eliminated, and an unusually tight pump is thusproduced.

While in the foregoing there has been show fand described the preferredembodiment of th invention iit is to be *understood that mino changes inthe details of construction, combina*- "tion and arrangement of partsmay be resorted .end thereof, .anda primemover including a .drive shaft,.asleeve .coupled .to the drive shaft andin axial alignment with .thelplunger rod, Va .cam

.disk .on .the sleeve, -a Ilate'rally .extending .arm

secured -onsaid plunger 'rod, .means son said arm engaging said cam sothat on rotation of said cam .disk .the .rod .reciprocates, ,and .meansto Aprevent rotation oi saidarmandirod.

.2. The combination 'o claim .-1 wherein said arm includes a pair'ofopposite'ly disposed .apertures, and -said .means on .said .arm includepins extending through said apertures.

I3. 'The combination `rof .claim .2 wherein shoes having heinispherical.recesses therein .are se .cured 'to .said cam disk, said .pins .being.seated linsaid recesses.

'llfThe .conib'ination of claim i1 wherein .said .arm includes .anelongated .s'ldt and .a .roller mounted Tin .said pump and .received .insaid slo't to prevent rotation of said arm and rod.

5. The combination of claim .l wherein said `.plunger rod includes a,pilot .extending into said sleeve.

RHEUEL H. FREDERICK.

REFERENCES CCIT-EI) The following references are of .record in the:fiile of this patent:

UNITED AS'IAES- PATENTS .Number Name .Date

1,409,057 Mitchell Mar. 7., y1922 .1,599,899 Kettering .et al. :Septlll, 1926 .1,708,306 Giesler Apr. 9, 1929 2,178,972 Sherman Nov. 7, 1939FOREIGN :PATENTS Niunber Countryv Date V21,2523 )Sweden (Jan. V12, .1904

